The invention discloses an engineering machinery supporting leg, and relates to the technical field of engineering machinery. The engineering machinery supporting leg comprises a main compression-resistant base, auxiliary compression-resistant bases and main hydraulic rods; the auxiliary compression-resistant bases are located on the two sides of the outer wall of the main compression-resistant base; the main hydraulic rods are located at the bottom of the main compression-resistant base; a fixed connecting block is fixedly arranged in the center of the top of the main compression-resistant base; and a protection pipe is fixedly arranged at the top, close to the fixed connecting block, of the main compression-resistant base; and the center of the outer wall of the protection pipe is provided with a protection sleeve in a sleeved mode. Through the main pressure-resistant base, the auxiliary pressure-resistant bases, a main buffer block, an auxiliary buffer block, a main stabilizing block and an auxiliary stabilizing block, engineering machinery can operate on the ground with an uneven roadbed, the working efficiency is improved, the construction period time is shortened, and throughthe main hydraulic rods, an auxiliary hydraulic rod, the protection sleeve, the fixed connecting block and a rotary connecting column, when the engineering machinery operates, the engineering machinery is supported on the supporting leg, so that tipping accidents are prevented, and the safety performance is improved.